East Pacific:
Hurricane Hilary - 65 knots, Tropical Storm Irwin - 50 knots, Low (Greg) - 25 knots
Storm Icon

Low (Greg) - 2017

  Jul. 14, 2017 - Jul. 28, 2017

View models in:

Google Maps Logo Google Maps


Google Earth Logo Google Earth
  • NHC best track data (Updated Friday, Jul. 28, 2017 0:00 Z)
  • NHC model data (Updated Thursday, Jul. 27, 2017 18:00 Z)

    NHC model error:

    Single Run Table Single Run Chart Average Table Average Chart Model Error

Model Intensity Diagrams ( View: Wind Speed | Pressure )

  • NHC model data (Updated Thursday, Jul. 27, 2017 18:00 Z)

Center Fix Data:

Google Maps Logo Google Maps


Google Earth Logo Google Earth
Click here for the model archive for this storm >

Best Track Position and Intensity as of:

Friday, Jul. 28, 2017 0:00 Z

Wind (1 min. avg.):

25 knots (29 mph | 13 m/s | 46 km/h)


1010 mb (29.83 inHg | 1010 hPa)

Location at the time:

545 statute miles (877 km) to the ESE (106°) from Hilo, on the island of Hawaii, HI, USA.


17.5N 147.1W   How far away is this from me?


National Hurricane Center's (NHC) Automated Tropical Cyclone Forecasting (ATCF) System and not from any available advisory data

Map shows latest best track data. It includes any adjustments made to previous data in the best track file. | Large Map
Click here to view this track in Google Earth.

Additional Best Track Information ( View all past best track data in table form )

  The following details were available in the best track file as of the last best track position update

Storm Number: 07

Level of tropical cyclone development:

Low (Sometimes incorrect)

Isobar Details:

The last closed isobar has a pressure of 1012 mb. (29.89 inHg | 1012 hPa) The radius of the last closed isobar is 105 nautical miles. (121 miles | 194 kilometers)

System Depth: Shallow

Radius of Max Winds:

100 nautical miles (115 miles | 185 kilometers)

Wind Field Details:

None listed.

Derived Data based on Best Track Information

  This information was automatically derived by our site for this storm from the latest best track data

6 Hour Average Movement ( About ):

Toward the W or 259° at 10.7 knots (12.3 mph | 19.8 km/h)

12 Hour Average Movement:

Toward the WSW or 257° at 11.3 knots (13.0 mph | 20.8 km/h)

24 Hour (1 Day) Average Movement:

Toward the WSW or 256° at 11.3 knots (13.0 mph | 20.9 km/h)

48 Hour (2 Day) Average Movement:

Toward the W or 275° at 10.6 knots (12.2 mph | 19.6 km/h)

120 Hour (5 Day) Average Movement:

Toward the W or 278° at 10.3 knots (11.8 mph | 19.0 km/h)

Accumulated Cyclone Energy (ACE) Index: 5.2650 104 kt2   About

Highest Sustained Wind achieved so far:

50 knots (58 mph | 26 m/s | 93 km/h)

Storm Icon for Highest Development

Highest Level of Development achieved so far:

Tropical Storm

Satellite Imagery

Storm Specific

Regional and Mesoscale Meteorology Branch (RAMMB) at NOAA/NESDIS Link Icon

An excellent site with a multitude of satellite images, wind analysis, intensity products and model data specific to this system. View: Satellite Products | Model Data

NESDIS Tropical Cyclone Products from NOAA's Satellite Services Division Link Icon

This page contains storm specific satellite imagery, Dvorak intensity estimates and positions, surface winds analysis and rainfall potential for this storm. Other worldwide storm data can be found here.

RealEarth™ in Google Maps from Space Science & Engineering Center (SSEC) at the University of Wisconsin-Madison Link Icon

This site has an incredible amount of satellite imagery available worldwide, with the ability to view days worth of satellite data.
Storm centered: AVN | Visible

Cooperative Institute for Meteorological Satellite Studies (CIMSS) at the University of Wisconsin-Madison Link Icon

A vast amount of storm specific imagery and other important imagery around the basin. Click here to jump right to the closeup storm imagery for this storm.

Interactive Weather Satellite Imagery Viewers from NASA's Global Hydrology and Climate Center Link Icon

This site has excellent closeup satellite imagery. Image loops also no longer require Java. Our site has a viewer here that allows you to jump right to this storm's satellite imagery. You can further zoom the satellite and choose a variety of other options once on the page.

Navy Research Laboratory (NRL) Monterey Link Icon

A site with some of the most detailed closeup imagery when available. If you want to view additional imagery or if you want to view loops of the images below, visit their site.
Normal Visible | Closeup Visible | IR (Color) | IR (Black & White)

CIMSS Tropical Cyclone Intensity Satellite Consensus (SATCON) Link Icon

This site provides satellite intensity estimates for storms that are a depression or higher. You can jump right to this storms page here.

Weather Underground's WunderMap Link Icon

This interactive map allows you to view weather station data, satellite imagery and radar imagery (for USA only, including Puerto Rico). Click here to view a storm centered version of this map.

Additional Satelite Imagery

In the left column there are direct links to storm centered imagery. In this column we provide the main link to sites that don't have a direct link that we can automatically provide with storm centered imagery.

Tropical Satellite Imagery from NOAA's Satellite Services Division Link Icon

This page contains wider satellite views of the Atlantic and Caribbean than NOAA's storm specific floaters. You can also view additional imagery for storms close to the United States by clicking here to view U. S. sector imagery from GOES West

Tropical Floaters from RAMMB at NOAA/NESDIS Link Icon

A selection of tropical floaters.

Penn State Department of Meteorology's e-WALL Link Icon

Contains a great visible floater when available. Also contains other visible, infrared and water vapor imagery.

Mauna Kea Weather Center Link Icon

Contains visible, infrared and water vapor imagery.

Ocean Data

Ship and Buoy Information from the National Data Buoy Center (NDBC) Link Icon

Click here to view any available ship and buoy reports within 250 nautical miles of the center of this storm. You can also click here to view a storm special page at the NDBC.

NOAA's Tides and Currents Link Icon

View tidal data for locations in the United States. Click here for a storm centered map of tidal data if this storm is near the U.S. If there is a tropical storm or hurricane warning issued in the U.S. for this storm, click here for a Storm QuickLook, which "provides a synopsis of near real-time oceanographic and meteorological observations at locations affected".